什么是rtm工艺

高压树枝传递魔术工艺是近些年针对汽车行业兴起的碳纤维复合材料快速成型工艺，在保证制品力学性能的前提下，其生产周期可缩短至十分钟以内， 大幅缩短了复合材料部件制造周期，成为汽车领域复合材料成型的首选工艺之一。他是利用高压将树枝对冲混合，并注入到预先铺设有纤维增强材料和预制嵌件的真空密闭模具内， 树枝流动脱模、近似固化和脱模后获得复合材料制品的成型工艺。这种工艺对树枝机体要求极高，要具有高消耗性、高浸润性、固化收缩率低、放热低、固化速度快等特点。关注我，带你了解更多胶粘剂，别忘了点个赞哦！

aircraft components the developed process chain consists of a fabric based preforming concept with sequential stamp draping followed by a high pressure resin transfer molding step completed by the file dreaming of the component key partners along the entire process chain were involved automated cnc cutting of the carbon textile from sgl ensures maximum accuracy a reproducible handling of the fabric stack ensures that the quality requirements are met five orientation is the key element of composite parts and can be controlled by the sequential stamp raping concept the stable preform can be demolded after curing of the binar system the preforming step from part to part takes less than ten minutes every producible resin nation requires high quality preforms ultrasonic trimming ensures minimum tolerance for the preform the hprtm mold is manufactured by lpax technologies within the sparta project which is part of the austrian takeoff program huntsman's aerodyte f aftu system provides suitable characteristics for aerospace applications the final trimming of the component can be carried out efficiently by hushmit the project demonstrated that the hprtm process can be transferred to the aerospace industry the highest quality standards can be met and the production efficiency is increased to satisfy future demands。

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so with the light rtm process as you can see we have it's basically a conventional a mold， so it's a composite mold and then we also have back here we have a matched upper mold and so we have an offset for the cavity thickness in this case what's our cavity thickness？ steve， that's two four ounce i see 30 i see forty four ounce so i have to be eight ounces so how thick are we gonna be in our company close to a quarter about about a quarter inch so one of the things with the light rtm process contrasting to traditional rtm processes the we have a lightweight upper so it's easy to handle with a couple of people or hoist instead of having clamps we're using this flange detail here where we're going to use full vacuum to clamp the molds together and keep them shut so we'll have full vacuum between the green mushroom seal and the black wing seal and then we'll have half vacuum in our part cavity and then we have a resin runner around the inside of this green mushroom seal where we're going to inject the resin at two different places at each end the resin is going to run around and fill the cavity to our vent in the center one of the other features about the flange detail is it's probably kind of hard to see on the video， but there's actually two hard stops here that will that will close against the mold flange and that controls are cavity thickness so we already have our mold loaded jordan's going to tell us in a little bit about the materials， but we're going to go ahead and close this up and get the injection started while we're continued to talk about about the process so with light rtm there are several different benefits we have a controlled part thickness， but we can do it several different you know we can do a pretty high production parts you know compared to other close mold processes like vacuum infusion so we don't have any sealant tape or any uh consumables to use we just close the mold use the the vacuum to to clamp the the ring and we're ready to inject so what they're hooking up now are the resin injection ports so these are fittings from rtm north， we have the receivers on the mold the 4104s and then the double lowering fittings that pop right in there， so steve's hooking up the flange vacuum now that's going to be our full vacuum side and we have a dual vacuum pump from rtm north， where we can do half vacuum for the cavity and full vacuum for the parameter so now we're pulling vacuum on the outer flange and this wing set seal will make contact with the lower mold and it'll pull the upper mold down until it hits the hard stops since we have a fixed cavity thickness we know exactly how much resin needs to go in the part， we set the stroke counter for the resin amount and we use the same amount of resin every time steve is explaining so we have our high vac on our our mold flange and we have half back on the inside and we can do a drop test and if we have a communication between those two areas we'll see it on our our drop test our gauge will move um， so we'll actually get high vac in the mold cavity thank you james kim trends focus for this year's show at chemics is our mold primers which is very important if you have complete composite tooling composite tooling whether it is molded or machined is going to have porosity and if you're trying to pull a vacuum on that you're not going to be able to get a good vacuum if you have air leaks inside your tool， so we recommend the use of a of a primer we have a new primer too for very porous materials like 3d printed material and also low density tooling board and then finally on the mold here for rtm our workhorse chemilies r and b thanks for us so as you see we've already started the injection， so we have two injection ports one at either end of the mold and the resin is flowing around the resin runner and into the cavity we have our vacuum vent here in the center， it's connected to our vacuum bowl so this will catch any excess resin that comes out we shouldn't have much extra resin and then we're connected to our pump on this side i'm jordan from vector ply this is velvet manager here to talk about needle ply we're the actual parts the upper and the lowers made out of this material so we've got a wide range of products and needle ply family the se products is what we used here today， um， the main purpose of these products to be using these tooling applications is for cosmetics and conformability today， the se product is really the the the the material of choice here um we do have other combinations of materials we do incorporate with knits and other materials you can check those out at our booth at vector ply right across over here we've got a lot of samples to hand out but these are brand new products for us new technology that we've been developing the last year or so as james mentioned i'm ashley duncan with polint and uh you're attending a light r t m demonstration， but i want to take a minute and just tell you a little bit about our materials and products that we used to to build the the tooling that we're using today uh plant has a full line of products uh four tooling construction， but i'm just gonna touch on the the few that we used for this process starting with our tooling gel coats we used the 945 series gel coats that we have for tooling that offer good surface hardness with excellent polishing properties for high gloss retention i also want to add some of the benefits of using the optoplus system with exceptional dimensional control we have very high glass content when we're infusing our tooling with this system and then also the i just want to point out to the tg requirements that we have this system is an excess of 170 c， which can provide for a good thermal property retention over the life of the tool as well okay， so that's the the tuling material so now i want to introduce our new this is a low profile rtm resin that we're demonstrating today it's called our polent a six one two five as i mentioned it's a low profile system it's designed for excellent surface cosmetics uh for your finished part without the need for a barrier coat or skin coat we do have some finished parts that are molded that you can see here uh on display uh with our ninety nine f series gel coat and an image black uh we can't joe coat here in the show hall， so steve obliged us with making those in advance so some of the benefits of this resin system is that it offers exceptional mechanical properties it's a low viscosity resin it's designed for um close mold processes it's a hundred center poise resin so ideal for a for good fiber wet out a rapid cure development as well that you can see in your process we're using one and a half percent in me k p nine from united and so we'll probably see a barcoal development and be ready to demold this in about an hour so yeah， so as you saw we injected the part filled in about six and a half minutes we clamped the the vent and the feed line how many strokes did we put in don two hundred fifty three okay tell us a little bit about the equipment we're using too yeah thanks james again my name is don williams who was magnavinis products wanted to talk about a few features of our system this morning this is a fully pneumatic system comes with recirculation it has a mope pressure guard the mole pressure guard is basically built into the system so that when the resin hits the flow front it'll sense the back pressure if the pressure gets too high can slow the pump down or it causes it completely stop until the pressure equalizes out in the parts， so you don't like blow your vacuum seal or cause any destruction to your mode。